The '140' was a reconnaissance/bomber aircraft, derived from the OKB-1 EF 131 with Soviet turbojet engines. The initial version, a tactical jet bomber with a secondary reconnaissance role, was initiated as the EF-140 by Dr. Brunolf Baade, at OKB-1, in 1947. The six Jumo 004 engines of the EF-131 were replaced by two Mikulin AM-TKRD-01 axial flow turbojets, rated at 32.372 kN (7,280 lb) thrust, in large nacelles attached to the underside of the wing at the same position.[1]
Using the airframe of the second EF-131 prototype, the '140' was very similar in appearance, and to its forebear Junkers Ju 287, with the classic Junkers-style crew compartment in the nose, wings swept forward 19°50' with marked dihedral, and the underslung engine nacelles extending forward of the leading-edge. Construction was of aluminium alloy stressed skin, with a semi-monocoque fuselage, wings with multiple spars covered with stressed skin panels, and high strength steel for highly stressed parts. Defensive armament consisted of VDB-6 dorsal and NDB-1M ventral remotely controlled turrets controlled by the gunner, in the rear of the crew compartment, using upper and lower periscopes.[1]
The prototype was completed quickly and ready for flight tests by late September 1948 after being disassembled and transported to Tyoply Stan airfield on the outskirts of Moscow. The first flight took place on 30 September 1948, but early test flights were disrupted by severe problems with the fuel control units of the AM-TKRD-01 engines. A replacement set was fitted and testing continued until the manufacturer's tests were completed on 24 May 1949.[1]
Council of Ministers directive No. 1886-696 called for development of 140 as a tactical reconnaissance aircraft powered by two Klimov VK-1 centrifugal flow turbo-jets. During the design work for the '140-R' the deficiencies highlighted by flight testing of the '140' were addressed as well as the addition of wingtip-mounted fuel tanks and new nacelles for the VK-1 engines, and the fitting of DT-V1 and DT-N1 turrets, replacing those of the '140', armed with 2 × 23mm cannon each. Flight testing of '140-R' commenced on 20 October at a specially built airfield near the GOZ-1 factory at Borki, (the German workers were not admitted to Tyoplyy Stan for security reasons), where four flights were carried out, all of which suffered from severe vibration of the wings.[1]
The final variant of '140' was the '140-B/R', which was a reconnaissance bomber, powered by the same engines but with increased weight and reduced performance. Design work, static tests and construction were complete and ground testing of the aircraft partially completed when all work on '140-R' and '140-B/R' aircraft was terminated by the Council of Ministers' directive No. 2474-974 issued on 18 June 1950.[1]
The initial prototype tactical jet bomber utilising the airframe of the second EF-131 with two Mikulin AM-TKRD-01 turbojet engines.
140-R
Converted from '140', the '140-R' was a reconnaissance aircraft powered by Klimov VK-1 engines and various improvements highlighted by flight testing of '140'.
140-B/R
A second '140 airframe, completed as a reconnaissance-bomber, which had partially completed ground tests, prior to flight testing, when the programme was cancelled.
Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft 1875–1995. London: Osprey. ISBN1-85532-405-9.
October 14, 2023
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The OKB 1 140 sometimes known as 001 was a jet bomber produced in the USSR from 1947 OKB 1 140Role Jet BomberNational origin USSRManufacturer GOZ 1Designer Brunolf BaadeFirst flight 30 September 1948Number built 2Developed from OKB 1 EF 131 Contents 1 Development 2 Variants 3 Specifications 140 R 4 See also 5 References 6 Further readingDevelopment EditThe 140 was a reconnaissance bomber aircraft derived from the OKB 1 EF 131 with Soviet turbojet engines The initial version a tactical jet bomber with a secondary reconnaissance role was initiated as the EF 140 by Dr Brunolf Baade at OKB 1 in 1947 The six Jumo 004 engines of the EF 131 were replaced by two Mikulin AM TKRD 01 axial flow turbojets rated at 32 372 kN 7 280 lb thrust in large nacelles attached to the underside of the wing at the same position 1 Using the airframe of the second EF 131 prototype the 140 was very similar in appearance and to its forebear Junkers Ju 287 with the classic Junkers style crew compartment in the nose wings swept forward 19 50 with marked dihedral and the underslung engine nacelles extending forward of the leading edge Construction was of aluminium alloy stressed skin with a semi monocoque fuselage wings with multiple spars covered with stressed skin panels and high strength steel for highly stressed parts Defensive armament consisted of VDB 6 dorsal and NDB 1M ventral remotely controlled turrets controlled by the gunner in the rear of the crew compartment using upper and lower periscopes 1 The prototype was completed quickly and ready for flight tests by late September 1948 after being disassembled and transported to Tyoply Stan airfield on the outskirts of Moscow The first flight took place on 30 September 1948 but early test flights were disrupted by severe problems with the fuel control units of the AM TKRD 01 engines A replacement set was fitted and testing continued until the manufacturer s tests were completed on 24 May 1949 1 Council of Ministers directive No 1886 696 called for development of 140 as a tactical reconnaissance aircraft powered by two Klimov VK 1 centrifugal flow turbo jets During the design work for the 140 R the deficiencies highlighted by flight testing of the 140 were addressed as well as the addition of wingtip mounted fuel tanks and new nacelles for the VK 1 engines and the fitting of DT V1 and DT N1 turrets replacing those of the 140 armed with 2 23mm cannon each Flight testing of 140 R commenced on 20 October at a specially built airfield near the GOZ 1 factory at Borki the German workers were not admitted to Tyoplyy Stan for security reasons where four flights were carried out all of which suffered from severe vibration of the wings 1 The final variant of 140 was the 140 B R which was a reconnaissance bomber powered by the same engines but with increased weight and reduced performance Design work static tests and construction were complete and ground testing of the aircraft partially completed when all work on 140 R and 140 B R aircraft was terminated by the Council of Ministers directive No 2474 974 issued on 18 June 1950 1 Variants EditThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed January 2021 Learn how and when to remove this template message 140 The initial prototype tactical jet bomber utilising the airframe of the second EF 131 with two Mikulin AM TKRD 01 turbojet engines 140 R Converted from 140 the 140 R was a reconnaissance aircraft powered by Klimov VK 1 engines and various improvements highlighted by flight testing of 140 140 B R A second 140 airframe completed as a reconnaissance bomber which had partially completed ground tests prior to flight testing when the programme was cancelled Specifications 140 R EditData from Early Soviet Jet Bombers 1 General characteristicsCrew 4 Length 19 25 m 63 ft 2 in Wingspan 21 87 m 71 ft 9 in Height 5 65 m 18 ft 6 in Wing area 61 m2 660 sq ft Empty weight 14 676 kg 32 355 lb Gross weight 25 543 kg 56 313 lb Powerplant 2 Mikulin AM TKRD 01 turbojet engines 26 487 kN 5 955 lbf thrust eachPerformance Maximum speed 837 km h 520 mph 452 kn Range 3 600 km 2 200 mi 1 900 nmi Service ceiling 14 100 m 46 300 ft Armament 2 23 mm 0 906 in cannon in a DT V1 dorsal barbette 2 23 mm 0 906 in cannon in a DT N1 ventral barbette 8 100 kg 220 lb SAB 100 75 high explosive bombs or 8 100 kg 220 lb SAB 100 55 high explosive bombs or 12 50 kg 110 lb FOTAB 50 35 flare bombsSee also Edit nbsp Aviation portalRelated development OKB 1 EF 131Aircraft of comparable role configuration and era English Electric CanberraReferences Edit a b c d e f Gordon Yefim 2004 Early Soviet Jet Bombers Hinkley Midland ISBN 978 1 85780 181 1 Further reading EditGunston Bill 1995 The Osprey Encyclopedia of Russian Aircraft 1875 1995 London Osprey ISBN 1 85532 405 9 Retrieved from https en wikipedia org w index php title OKB 1 140 amp oldid 1089405437, wikipedia, wiki, book, 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